procedure TForm1.Button1Click(Sender: TObject);
begin
  EnableWindow(FindWindowEx(FindWindow('Shell_TrayWnd', nil), 0, 'Button', nil), False);
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
    EnableWindow(FindWindowEx(FindWindow('Shell_TrayWnd', nil), 0, 'Button', nil), True);
end;